CN115572913A - Fire-resistant high-strength steel and production method thereof - Google Patents
Fire-resistant high-strength steel and production method thereof Download PDFInfo
- Publication number
- CN115572913A CN115572913A CN202211094941.7A CN202211094941A CN115572913A CN 115572913 A CN115572913 A CN 115572913A CN 202211094941 A CN202211094941 A CN 202211094941A CN 115572913 A CN115572913 A CN 115572913A
- Authority
- CN
- China
- Prior art keywords
- temperature
- steel plate
- percent
- vacuum
- resistant high
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/003—Cementite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a fire-resistant high-strength steel and a production method thereof, wherein the steel plate comprises the following chemical components of, by mass, 0.3-0.5% of C, 0.3-0.6% of Mn, 0.07-0.12% of V, 5-6% of Ni, 19-21.2% of Cr, 10-19% of Mo, and the balance of Fe and inevitable impurity elements; the production method comprises the working procedures of heating, rolling and heat treatment, wherein the heat treatment adopts a quenching and tempering mode. Through reasonable component design and process improvement, the obtained steel plate has high strength and elongation and low yield ratio, the tensile strength Rm of the steel plate is more than or equal to 1000MPa, the hardness is 300-350HB, the elongation is more than or equal to 14%, the normal-temperature U-shaped impact energy is more than 80J, the high-temperature tensile property at 1000 ℃, and the yield strength is more than or equal to 600MPa.
Description
Technical Field
The invention belongs to the technical field of steel, and particularly relates to refractory high-strength steel and a production method thereof.
Background
GB/T28415-2012 states that the yield strength of the refractory steel at the high temperature of 600 ℃ is not less than 2/3 of the standard yield strength at the room temperature so as to ensure the safety performance of the building at the high temperature. But for special fields such as nuclear power, military industry and the like, the index is far from sufficient, and the service environment of the index is worse, so the requirement is higher.
Disclosure of Invention
The invention aims to provide fire-resistant high-strength steel and a production method thereof, wherein the tensile strength Rm of the provided steel plate is more than or equal to 1000MPa, the hardness is 300-350HB, the elongation is more than or equal to 14%, the normal-temperature U-shaped impact energy is more than 80J, and the yield strength is more than or equal to 600MPa in the high-temperature tensile property at 1000 ℃.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the fire-resistant high-strength steel comprises the following chemical components in percentage by mass: 0.3 to 0.5 percent of C, 0.3 to 0.6 percent of Mn, 0.07 to 0.12 percent of V, 5 to 6 percent of Ni, 19 to 21.2 percent of Cr, 10 to 19 percent of Mo, and the balance of Fe and inevitable impurity elements.
The refractory high-strength steel disclosed by the invention has the following functions of various chemical elements:
c: the yield point and the tensile strength of the steel plate can be improved, particularly the strength index at high temperature, but the plasticity and the impact property are reduced, so that solid solution needs to be formed by matching with other elements, then a reasonable heat treatment process is combined, a martensite structure with large-angle grain boundaries is formed, and the influence on the toughness is reduced. In order to ensure the high-temperature tensile property at 1000 ℃, the C content cannot be lower than 0.3 percent, but cannot be too high to affect the weldability, so the design value is between 0.3 and 0.5 percent.
Mn: improving the strength index elements, leading the quenched and tempered structure of the steel to be uniform and refined, avoiding the aggregation and blocking of carbides in a carburized layer, but increasing the overheating sensitivity and the tempering brittleness tendency of the steel. Meanwhile, the manganese strongly reduces the Ar1 and martensite transformation temperature (second to carbon) of the steel and the phase transformation speed in the steel, improves the hardenability of the steel and increases the content of retained austenite. In order to reduce the residual austenite content and the tendency to be sensitive to overheating and to temper brittleness, the Mn content is deliberately reduced in the design of the composition, with design values of between 0.3 and 0.6%.
V: because vanadium and carbon can form stable and refractory carbide, basically strengthening, the steel still keeps a fine crystalline structure at a higher temperature, the hardenability of the steel is adjusted, the overheating sensitivity of the steel is greatly reduced, and the high-temperature strength performance is improved; and the carbide of vanadium is the hardest and most wear-resistant of metal carbide, and the hardness and wear resistance of the tool steel can be improved by the carbide which is dispersed, so that the design value is between 0.07 and 0.12 percent, and when the design value is too high, the structure can be coarsened.
Ni: nickel is an element that expands the gamma phase region to form an infinite solid solution, and is a main element in austenitic stainless steel. Since nickel can lower critical transformation humidity and reduce diffusion speed of each element in steel, it can improve hardenability of steel. And the nickel can refine ferrite grains and improve the low-temperature performance of the steel. The low-temperature brittle transition temperature of the carbon steel containing nickel exceeding a certain value is obviously reduced, and the low-temperature impact toughness is obviously improved, so the nickel steel is commonly used for low-temperature materials. Since Ni is a noble metal, it is generally designed to be 5 to 6% for high carbon type refractory steels.
Mo: molybdenum has a solid solution strengthening effect on ferrite, and simultaneously, the stability of carbide is also improved, so that the strength of the steel is improved. When the molybdenum coexists with chromium, manganese and the like, the temper brittleness caused by other elements is reduced or inhibited; can form a composite cementite with iron and carbon, improve the strength and increase the high-temperature fire resistance; meanwhile, molybdenum plays a beneficial role in improving the ductility and toughness as well as the wear resistance of the steel. For high-temperature fire resistance, mo can be designed in a wide range of 10-19%.
Cr: chromium and carbon form various carbides, the carbides are dissolved in ferrite, an austenite phase region is reduced, the decomposition speed of austenite is slowed down, the hardenability of steel is obviously improved, namely the strength is improved, the carbide of chromium has high melting point and certain high temperature resistance, and the carbide of chromium is generally designed to be 19-21.2% for high-carbon type refractory steel.
The production method of the fire-resistant high-strength steel comprises the working procedures of smelting, heating, rolling and heat treatment.
The smelting process of the invention comprises the following steps of producing a bale sample P by an electric furnace: less than or equal to 0.010 percent, adding 400-650 m of Al wire after tapping, controlling the alkalinity of refining between 6-8 and the sulfur content between 0.002-0.005 percent at the later stage of refining during smelting; vacuum adopts a mode of 13+7, namely after vacuum argon blowing is carried out for 13-15min, the vacuum is broken and micro alloy is added for fine adjustment, and after the vacuum is broken, soft blowing is carried out for more than 7-12 min; and VD blowing argon gas for vacuum stirring, wherein the total vacuum time is controlled to be 30-35min.
According to the heating process, the content of the steel plate alloy is high, the heat conductivity is poor, the heating time is 90-100 hours, and the residual oxygen content is less than or equal to 0.5ppm; the rolling thickness of the steel plate is 20-50mm; the residence time in the heating section is 3-5 hours, the highest heating temperature is less than or equal to 1180 ℃, the temperature rise is ensured to be uniform and stable, the residence time of the steel billet in the soaking section is 10-15 hours, and the soaking temperature is 1140-1160 ℃.
According to the rolling process, the initial rolling temperature of the steel plate is more than or equal to 1150 ℃, the final rolling temperature is more than or equal to 980 ℃, and the steel plate is rapidly rolled in multiple passes with small rolling reduction.
In the heat treatment process, the steel plate adopts quenching and tempering heat treatment, and the quenching temperature is as follows: 750-800 deg.C, 1.5-2.0min/mm, oil cooling; tempering heat treatment: keeping the temperature at 500-550 ℃ for 5-6 hours, and cooling in air.
The thickness of the steel plate is 20-50mm.
The invention aims to provide fire-resistant high-strength steel and a production method thereof, which are used for realizing the production of fire-resistant steel plates in special fields such as nuclear power, military industry and the like, wherein one mechanical requirement is high-temperature tensile property at 1000 ℃, and a common fire-resistant experiment at 600 ℃ in a non-general field ensures the fire-resistant requirement in the special field; meanwhile, the yield ratio is required, so that the steel plate has certain shock resistance. In the aspect of component design, the reduction of retained austenite and the reduction of overheating sensitivity and temper brittleness are realized by reducing Mn; the vanadium carbide and Mo composite cementite which are dispersed are separated out, so that the strength is improved, and the high-temperature fire resistance is increased, and the production of the high-strength fire-resistant plate is realized. The steel plate is subjected to heat treatment in a sub-temperature tempering mode, and the obtained steel plate is high in strength, high in elongation and low in yield ratio, and is favorable for producing nuclear power and military industry support frames. The tensile strength Rm of the steel plate is more than or equal to 1000MPa, the yield ratio is less than or equal to 0.92, the hardness is 300-350HB, the elongation is more than or equal to 14%, the normal-temperature U-shaped impact energy is more than 80J, and the yield strength is more than or equal to 600MPa in the high-temperature tensile property at 1000 ℃.
Detailed Description
The technical solution of the present invention is further described in detail by the following specific examples.
Example 1
The thickness of the steel plate is 20mm, and the steel plate comprises the following chemical components in percentage by mass: 0.3% of C, 0.3% of Mn, 0.070% of V, 5.1% of Ni, 19.0% of Cr, 10% of Mo and the balance of Fe and inevitable impurity elements;
the production method of the steel plate comprises the working procedures of smelting heating, rolling and heat treatment, and specifically comprises the following steps:
large ladle sample P produced by an electric furnace: 0.010 percent, adding 400m of Al wire after tapping, controlling the alkalinity of refining at 6 during smelting, and controlling the sulfur content at the later stage of refining at 0.005 percent. And the vacuum mode is 13+7, namely after argon is blown for 13min, the vacuum is broken, microalloy is added for fine adjustment, and soft blowing is carried out for 7min after the vacuum is broken. And VD blowing argon gas for vacuum stirring, wherein the total vacuum time is controlled to be 30min.
The steel plate has high alloy content, poor thermal conductivity, heating time of 90 hours and residual oxygen content of 0.4ppm.
The residence time of the billet in the heating section is 3 hours, the maximum heating temperature is 1170 ℃, the temperature rise is ensured to be uniform and stable, the residence time of the billet in the soaking section is 107 hours, and the soaking temperature is 1160 ℃.
The steel plate is rolled at the beginning temperature of 1180 ℃ and the final temperature of 1020 ℃ in a multi-pass and small reduction rapid rolling mode.
Quenching and tempering heat treatment is adopted for the steel plate, and the quenching temperature is as follows: 750 ℃,1.5min/mm, oil cooling. Tempering heat treatment: keeping the temperature at 500 ℃ for 5 hours, and cooling in air.
The steel plate needs to be rustproof in a painting mode after being produced.
The mechanical properties of the steel plate of the embodiment are as follows: yield strength: 950Mpa, 1060Mpa tensile strength, 0.896 yield ratio (yield strength/tensile strength), 310HB hardness, 15% elongation, 102J, 110J, 96J normal temperature impact energy; the yield strength is 735Mpa in the tensile property at the high temperature of 1000 ℃.
Example 2
The thickness of the steel plate is 26mm, and the steel plate comprises the following chemical components in percentage by mass: 0.4% of C, 0.38% of Mn, 0.088% of V, 5.2% of Ni, 19.5% of Cr, 10.9% of Mo, and the balance of Fe and inevitable impurity elements;
the production method of the steel plate comprises the working procedures of smelting, heating, rolling and heat treatment, and specifically comprises the following steps:
large ladle sample P produced by an electric furnace: 0.009%, adding 450m of Al wire after tapping, controlling the alkalinity of refining at 6.5 during smelting, and controlling the sulfur content at the later stage of refining to be 0.0038%. And the vacuum mode is 13+7, namely after argon is blown in vacuum for 13.5min, the vacuum is broken, microalloy is added for fine adjustment, and soft blowing is carried out for 8min after the vacuum is broken. VD blows argon gas to carry out vacuum stirring, and the total vacuum time is controlled to be 32min.
The steel plate has high alloy content, poor heat conductivity, heating time of 95 hours and residual oxygen content of 0.3ppm.
The steel plate stays for 3.5 hours in the heating section, the maximum heating temperature is 1160 ℃, the temperature rise is ensured to be uniform and stable, the steel billet stays for 12 hours in the soaking section, and the soaking temperature is 1146 ℃.
The steel plate is rolled at the beginning temperature of 1180 ℃ and the final temperature of 1010 ℃ in a multi-pass and small-reduction quick rolling mode.
Quenching and tempering heat treatment is adopted for the steel plate, and the quenching temperature is as follows: 790 ℃,1.8min/mm, oil cooling. Tempering heat treatment: keeping the temperature at 530 ℃ for 5.7 hours, and cooling in air.
The steel plate needs to be rustproof in a painting mode after being produced.
The mechanical properties of the steel plate of the embodiment are as follows: yield strength: 940Mpa, 1030Mpa of tensile strength, 0.912 of yield ratio (yield strength/tensile strength), 340HB of hardness, 14.5% of elongation percentage and 122J, 107J and 106J of normal temperature impact energy; the yield strength is 750MPa in the tensile property at the high temperature of 1000 ℃.
Example 3
The thickness of the steel plate is 30mm, and the steel plate comprises the following chemical components in percentage by mass: 0.45% of C, 0.42% of Mn, 0.089% of V, 5.7% of Ni, 20.2% of Cr, 15% of Mo and the balance of Fe and inevitable impurity elements;
the production method of the steel plate comprises the working procedures of smelting, heating, rolling and heat treatment, and specifically comprises the following steps:
large ladle sample P produced by an electric furnace: 0.008 percent, adding 550m of Al wire after tapping, controlling the alkalinity of refining at 7 during smelting, and controlling the sulfur content at the later stage of refining to be 0.0028 percent. Vacuum adopts a mode of 13+7, namely after argon is blown in vacuum for 14.5min, the vacuum is broken, microalloy is added for fine adjustment, and soft blowing is carried out for more than 10min after the vacuum is broken. VD blows argon gas to carry out vacuum stirring, and the total vacuum time is controlled to be 33min.
The steel plate has high alloy content, poor thermal conductivity, 97 hours of heating time and 0.2ppm of residual oxygen content.
The steel plate stays for 3.8 hours in the heating section, the maximum heating temperature is 1170 ℃, meanwhile, the temperature rise is ensured to be uniform and stable, the steel billet stays for 13.5 hours in the soaking section, and the soaking temperature is 1145 ℃.
The steel plate is rolled at the beginning temperature of 1170 ℃, the final rolling temperature of 1020 ℃ and rapidly rolled in multiple passes with small rolling reduction.
Quenching and tempering heat treatment is adopted for the steel plate, and the quenching temperature is as follows: 780 ℃,1.8min/mm, oil cooling. Tempering heat treatment: keeping the temperature at 530 ℃ for 5 hours, and cooling in air.
The steel plate needs to be rustproof in a painting mode after being produced.
The mechanical properties of the steel plate of the embodiment are as follows: yield strength: 960Mpa, tensile strength 1080Mpa, yield ratio 0.912 (yield strength/tensile strength), hardness 345HB, elongation 14%, normal temperature impact energy 102J, 97J, 96J; the yield strength is 730MPa in the tensile property at the high temperature of 1000 ℃.
Example 4
The thickness of the steel plate is 37mm, and the steel plate comprises the following chemical components in percentage by mass: 0.41 percent of C, 0.48 percent of Mn, 0.093 percent of V, 5.7 percent of Ni, 20.5 percent of Cr, 17.2 percent of Mo, and the balance of Fe and inevitable impurity elements;
the production method of the steel plate comprises the working procedures of smelting, heating, rolling and heat treatment, and specifically comprises the following steps:
large ladle sample P produced by an electric furnace: 0.007 percent, after tapping, 550m of Al wire is added, during smelting, the alkalinity of refining is controlled at 7, and the sulfur content in the later stage of refining is 0.0031 percent. Vacuum adopts a mode of 13+7, namely after argon is blown for 14min, the vacuum is broken, microalloy is added for fine adjustment, and soft blowing is carried out for more than 10min after the vacuum is broken. And VD blowing argon gas for vacuum stirring, wherein the total vacuum time is controlled to be 34min.
The steel plate has high alloy content, poor thermal conductivity, heating time of 95 hours and residual oxygen content of 0.2ppm.
The residence time of the steel plate in the heating section is 3.5 hours, the maximum heating temperature is 1160 ℃, the temperature rise is ensured to be uniform and stable, the residence time of the steel billet in the soaking section is 13.0 hours, and the soaking temperature is 1140 ℃.
The steel plate is rolled at the beginning temperature of 1170 ℃, the final rolling temperature of 1010 ℃, and the steel plate is rapidly rolled in multiple passes with small rolling reduction.
Quenching and tempering heat treatment is adopted for the steel plate, and the quenching temperature is as follows: 785 ℃,1.7min/mm, oil cooling. Tempering heat treatment: and (4) keeping the temperature at 535 ℃ for 5 hours, and cooling in air.
The steel plate needs to be rustproof in a painting mode after being produced.
The mechanical properties of the steel plate of the embodiment are as follows: yield strength: 950Mpa, tensile strength 1075Mpa, yield ratio 0.884 (yield strength/tensile strength), hardness 342HB, elongation 14.5%, normal temperature impact energy 92J, 97J, 112J; the yield strength is 735MPa in the tensile property at high temperature of 1000 ℃.
Example 5
The thickness of the steel plate is 42mm, and the steel plate comprises the following chemical components in percentage by mass: 0.39% of C, 0.50% of Mn, 0.095% of V, 5.5% of Ni, 20.8% of Cr, 16.9% of Mo, and the balance of Fe and inevitable impurity elements;
the production method of the steel plate comprises the working procedures of smelting, heating, rolling and heat treatment, and specifically comprises the following steps:
large ladle sample P produced by an electric furnace: 0.008 percent, 600m of Al wire is added after tapping, the alkalinity of refining is controlled at 7.2 during smelting, and the sulfur content at the later stage of refining is 0.0029 percent. Vacuum adopts a mode of 13+7, namely after argon is blown in vacuum for 15min, the vacuum is broken and the microalloy is added for fine adjustment, and after the vacuum is broken, soft blowing is carried out for more than 12min. And VD blowing argon gas for vacuum stirring, wherein the total vacuum time is controlled to be 34min.
The steel plate has high alloy content, poor thermal conductivity, heating time of 95 hours and residual oxygen content of 0.3ppm.
The steel plate stays for 4 hours in the heating section, the maximum heating temperature is 1180 ℃, meanwhile, the temperature rise is ensured to be uniform and stable, the steel billet stays for 14 hours in the soaking section, and the soaking temperature is 1145 ℃.
The initial rolling temperature of the steel plate is 1160 ℃, the final rolling temperature is 1010 ℃, and the steel plate is rapidly rolled in multiple passes with small rolling reduction.
Quenching and tempering heat treatment is adopted for the steel plate, and the quenching temperature is as follows: 790 ℃,1.8min/mm, oil cooling. Tempering and heat treatment: keeping the temperature at 540 ℃ for 5.3 hours, and cooling in air.
The steel plate needs to be rustproof in a painting mode after being produced.
The mechanical properties of the steel plate of the embodiment are as follows: yield strength: 920MPa, tensile strength of 1010MPa, yield ratio of 0.911 (yield strength/tensile strength), hardness of 345HB, elongation of 15.5 percent and normal temperature impact energy of 102J, 117J and 106J; the yield strength is 720MPa in the high-temperature tensile property of 1000 ℃.
Example 6
The thickness of the steel plate is 46mm, and the steel plate comprises the following chemical components in percentage by mass: 0.48% of C, 0.52% of Mn, 0.114% of V, 5.8% of Ni, 20.2% of Cr, 18.5% of Mo and the balance of Fe and inevitable impurity elements;
the production method of the steel plate comprises the working procedures of smelting, heating, rolling and heat treatment, and specifically comprises the following steps:
large ladle sample P produced by an electric furnace: 0.007, adding 650m of Al wire after tapping, controlling the alkalinity of refining at 8 during smelting, and controlling the sulfur content at the later stage of refining to be 0.0022%. Vacuum adopts a mode of 13+7, namely after argon is blown for 15min, the vacuum is broken, microalloy is added for fine adjustment, and soft blowing is carried out for more than 12min after the vacuum is broken. And VD blowing argon gas for vacuum stirring, wherein the total vacuum time is controlled to be 35min.
The steel plate has high alloy content, poor heat conductivity, 92 hours of heating time and 0.3ppm of residual oxygen content.
The steel plate stays for 4.5 hours in the heating section, the maximum heating temperature is 1170 ℃, meanwhile, the temperature rise is ensured to be uniform and stable, the steel billet stays for 14.5 hours in the soaking section, and the soaking temperature is 1145 ℃.
The steel plate is rolled at the beginning temperature of 1180 ℃ and the final rolling temperature of 980 ℃ in a multi-pass and small reduction rapid rolling mode.
Quenching and tempering heat treatment is adopted for the steel plate, and the quenching temperature is as follows: 790 ℃,1.9min/mm, oil cooling. Tempering heat treatment: keeping the temperature at 545 ℃ for 5.7 hours, and cooling in air.
After the steel plate is produced, a painting mode is needed for rust prevention.
The mechanical properties of the steel plate of the embodiment are as follows: yield strength: 910Mpa, tensile strength 1095Mpa, yield ratio 0.915 (yield strength/tensile strength), hardness 340HB, elongation 16% and normal temperature impact energy 82J, 101J and 96J; the yield strength is 710MPa in the tensile property at high temperature of 1000 ℃.
Example 7
The thickness of the steel plate is 50mm, and the steel plate comprises the following chemical components in percentage by mass: 0.5% of C, 0.6% of Mn, 0.12% of V, 6% of Ni, 21.2% of Cr, 19% of Mo, and the balance of Fe and inevitable impurity elements;
the production method of the steel plate comprises the working procedures of smelting, heating, rolling and heat treatment, and specifically comprises the following steps:
large ladle sample P produced by an electric furnace: 0.010 percent, al wire 6650m is added after tapping, the alkalinity of refining is controlled at 6 during smelting, and the sulfur content in the later stage of refining is 0.002 percent. Vacuum adopts a mode of 13+7, namely after argon is blown in vacuum for 15min, the vacuum is broken and the microalloy is added for fine adjustment, and soft blowing is carried out for 12min after the vacuum is broken. And VD blowing argon gas for vacuum stirring, wherein the total vacuum time is controlled to be 35min.
The steel plate has high alloy content, poor thermal conductivity, 100 hours of heating time and 0.2ppm of residual oxygen content.
The steel plate stays for 5 hours in the heating section, the maximum heating temperature is 1170 ℃, meanwhile, the temperature rise is ensured to be uniform and stable, the steel billet stays for 15 hours in the soaking section, and the soaking temperature is 1145 ℃.
The steel plate is rolled at the beginning temperature of 1170 ℃, the final rolling temperature of 1020 ℃ and rapidly rolled in multiple passes with small rolling reduction.
Quenching and tempering heat treatment is adopted for the steel plate, and the quenching temperature is as follows: 800 ℃,2min/mm, oil cooling. Tempering heat treatment: preserving the heat for 5 hours at 550 ℃, and cooling in air.
The steel plate needs to be rustproof in a painting mode after being produced.
The mechanical properties of the steel plate of the embodiment are as follows: yield strength: 905MPa, tensile strength 1090MPa, yield ratio 0.914 (yield strength/tensile strength), hardness of 310HB, elongation of 17%, and normal temperature impact energy of 92J, 97J and 95J; the yield strength is 705MPa in the tensile property at the high temperature of 1000 ℃.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (9)
1. A fire-resistant high-strength steel is characterized in that: the steel plate comprises the following chemical components in percentage by mass: 0.3 to 0.5 percent of C, 0.3 to 0.6 percent of Mn, 0.07 to 0.12 percent of V, 5 to 6 percent of Ni, 19 to 21.2 percent of Cr, 10 to 19 percent of Mo, and the balance of Fe and inevitable impurity elements.
2. A method of producing fire-resistant high-strength steel according to claim 1, comprising the steps of smelting, heating, rolling and heat treatment; wherein the heat treatment process adopts a quenching and tempering mode, and the quenching temperature is as follows: cooling with oil at 750-800 deg.C for 1.5-2.0 min/mm; tempering temperature: keeping the temperature at 500-550 ℃ for 5-6 hours, and cooling in air.
3. The method for producing fire-resistant high-strength steel according to claim 2, characterized in that: in the smelting process, the ladle sample P is less than or equal to 0.010 percent, and an Al wire of 400-650 m is added after tapping; vacuum adopts a mode of 13+7, namely vacuum argon blowing is carried out for 13-15min, vacuum is broken, microalloy is added for fine adjustment, and soft blowing is carried out for 7-12min after vacuum is broken.
4. The method for producing fire-resistant high-strength steel according to claim 2 or 3, wherein: in the smelting process, VD blows argon gas to carry out vacuum stirring, and the total vacuum time is controlled to be 30-35min.
5. The method for producing fire-resistant high-strength steel according to claim 2, characterized in that: in the heating procedure, the heating time is 90-100 hours, and the residual oxygen content is less than or equal to 0.5ppm.
6. The method for producing fire-resistant high-strength steel according to claim 2, characterized in that: in the heating procedure, the residence time of the steel billet in the heating section is 3-5 hours, the highest heating temperature is less than or equal to 1180 ℃, and the uniform and stable temperature rise is ensured; the residence time of the steel billet in the soaking section is 10 to 15 hours, and the soaking temperature is 1140 to 1160 ℃.
7. The method for producing fire-resistant high-strength steel according to claim 2, wherein: in the rolling process, the initial rolling temperature is more than or equal to 1150 ℃, and the final rolling temperature is more than or equal to 980 ℃.
8. The method for producing fire-resistant high-strength steel according to claim 2, characterized in that: during smelting, the alkalinity of refining is controlled between 6 and 8, and the sulfur content in the later period of refining is between 0.002 and 0.005 percent.
9. The method for producing fire-resistant high-strength steel according to claim 2, wherein the steel plate is required to be rustproof by painting after production.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211094941.7A CN115572913B (en) | 2022-09-08 | 2022-09-08 | Fireproof high-strength steel and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211094941.7A CN115572913B (en) | 2022-09-08 | 2022-09-08 | Fireproof high-strength steel and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115572913A true CN115572913A (en) | 2023-01-06 |
| CN115572913B CN115572913B (en) | 2023-07-25 |
Family
ID=84580878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211094941.7A Active CN115572913B (en) | 2022-09-08 | 2022-09-08 | Fireproof high-strength steel and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115572913B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02298605A (en) * | 1989-05-12 | 1990-12-11 | Hitachi Ltd | Gas turbine shroud and manufacture thereof |
| JPH04263047A (en) * | 1991-02-15 | 1992-09-18 | Kobe Steel Ltd | High strength fire resisting bolt excellent in delayed fracture resistance |
| EP1277848A1 (en) * | 2001-07-19 | 2003-01-22 | Mitsubishi Heavy Industries, Ltd. | High-strength heat-resistant steel, process for producing the same, and process for producing high-strength heat-restistant pipe |
| JP2004002990A (en) * | 2002-03-29 | 2004-01-08 | Nippon Steel Corp | High-strength steel for fireproof building structure having yield stress at room temperature of above 455n/mm2 and superior in high-temperature property at 800 °c, and method for manufacturing thick steel plate thereof |
| CN102605291A (en) * | 2012-03-27 | 2012-07-25 | 宝山钢铁股份有限公司 | Ni-saving austenitic stainless steel cold-rolled sheet with excellent processability and manufacturing method thereof |
| CN104532156A (en) * | 2014-12-19 | 2015-04-22 | 宝山钢铁股份有限公司 | Quenched and tempered high strength steel with 1300 MPa grade of yield strength and production method thereof |
| JP2015218360A (en) * | 2014-05-16 | 2015-12-07 | 新日鐵住金株式会社 | Rolled steel and production method therefor |
| CN105525209A (en) * | 2016-01-18 | 2016-04-27 | 内蒙古包钢钢联股份有限公司 | Low-yield-ratio Q460GJ construction steel plate and production method thereof |
| CN106282800A (en) * | 2016-09-07 | 2017-01-04 | 舞阳钢铁有限责任公司 | A kind of surrender 345MPa level refractory steel plates and production method thereof |
| CN108866441A (en) * | 2013-06-27 | 2018-11-23 | 日新制钢株式会社 | The wearability steel and its manufacturing method of material of excellent fatigue characteristics |
| CN111101063A (en) * | 2020-01-07 | 2020-05-05 | 北京科技大学 | 690 MPa-grade anti-seismic, corrosion-resistant and fire-resistant medium plate steel and manufacturing method thereof |
| US20200270716A1 (en) * | 2017-10-19 | 2020-08-27 | Gary M Cola, Jr. | High strength steels, processes for making same, and materials resulting therefrom |
| US20210395849A1 (en) * | 2020-06-19 | 2021-12-23 | Central Iron & Steel Research Institute | High-Strenth Low-Carbon Bainitic Fire-Resistant Steel And Preparation Method Thereof |
-
2022
- 2022-09-08 CN CN202211094941.7A patent/CN115572913B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02298605A (en) * | 1989-05-12 | 1990-12-11 | Hitachi Ltd | Gas turbine shroud and manufacture thereof |
| JPH04263047A (en) * | 1991-02-15 | 1992-09-18 | Kobe Steel Ltd | High strength fire resisting bolt excellent in delayed fracture resistance |
| EP1277848A1 (en) * | 2001-07-19 | 2003-01-22 | Mitsubishi Heavy Industries, Ltd. | High-strength heat-resistant steel, process for producing the same, and process for producing high-strength heat-restistant pipe |
| JP2004002990A (en) * | 2002-03-29 | 2004-01-08 | Nippon Steel Corp | High-strength steel for fireproof building structure having yield stress at room temperature of above 455n/mm2 and superior in high-temperature property at 800 °c, and method for manufacturing thick steel plate thereof |
| CN102605291A (en) * | 2012-03-27 | 2012-07-25 | 宝山钢铁股份有限公司 | Ni-saving austenitic stainless steel cold-rolled sheet with excellent processability and manufacturing method thereof |
| CN108866441A (en) * | 2013-06-27 | 2018-11-23 | 日新制钢株式会社 | The wearability steel and its manufacturing method of material of excellent fatigue characteristics |
| JP2015218360A (en) * | 2014-05-16 | 2015-12-07 | 新日鐵住金株式会社 | Rolled steel and production method therefor |
| CN104532156A (en) * | 2014-12-19 | 2015-04-22 | 宝山钢铁股份有限公司 | Quenched and tempered high strength steel with 1300 MPa grade of yield strength and production method thereof |
| CN105525209A (en) * | 2016-01-18 | 2016-04-27 | 内蒙古包钢钢联股份有限公司 | Low-yield-ratio Q460GJ construction steel plate and production method thereof |
| CN106282800A (en) * | 2016-09-07 | 2017-01-04 | 舞阳钢铁有限责任公司 | A kind of surrender 345MPa level refractory steel plates and production method thereof |
| US20200270716A1 (en) * | 2017-10-19 | 2020-08-27 | Gary M Cola, Jr. | High strength steels, processes for making same, and materials resulting therefrom |
| CN111101063A (en) * | 2020-01-07 | 2020-05-05 | 北京科技大学 | 690 MPa-grade anti-seismic, corrosion-resistant and fire-resistant medium plate steel and manufacturing method thereof |
| US20210395849A1 (en) * | 2020-06-19 | 2021-12-23 | Central Iron & Steel Research Institute | High-Strenth Low-Carbon Bainitic Fire-Resistant Steel And Preparation Method Thereof |
Non-Patent Citations (1)
| Title |
|---|
| 赵喜伟等: "低屈强比超高强EH690钢板的研发", 轧钢, vol. 39, no. 3, pages 103 - 107 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115572913B (en) | 2023-07-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108315639A (en) | A kind of high tenacity 600MPa grades of beam steels and its production method | |
| WO2011061812A1 (en) | High-toughness abrasion-resistant steel and manufacturing method therefor | |
| WO2020062564A1 (en) | Ultrahigh-steel q960e slab and manufacturing method | |
| CN111455269A (en) | Yield strength 960MPa grade very high strength marine steel plate and manufacturing method thereof | |
| CN113106327B (en) | High corrosion-resistant strip steel and manufacturing method thereof | |
| CN112813344B (en) | High-strength high-toughness easy-to-weld structural steel plate with yield strength of 620MPa and preparation method thereof | |
| CN113249643B (en) | Mining high-strength carburized chain steel and preparation method thereof | |
| CN102653845A (en) | Steel plate for LPG (Liquefied Petroleum Gas) ship storage tank and production method of steel plate | |
| CN110157987B (en) | NQT-process-based large-thickness wear-resistant steel plate with good-40-DEG C low-temperature toughness and preparation method thereof | |
| CN114134431B (en) | 2000 Mpa-grade high-strength high-toughness high-hardenability spring steel by square billet continuous casting and rolling and manufacturing method thereof | |
| CN105937008A (en) | Thin-specification wear resisting steel and manufacturing method thereof | |
| CN109722598A (en) | A kind of 12Cr1MoV adds vanadium chrome molybdenum steel plate and its production method | |
| CN112063917B (en) | Wear-resistant steel plate for artificial board machine equipment and manufacturing method thereof | |
| CN112195417B (en) | High-wear-resistance and high-toughness steel bar for excavator bucket teeth and preparation method thereof | |
| CN115572913B (en) | Fireproof high-strength steel and production method thereof | |
| CN114134387B (en) | 1300 MPa-tensile-strength thick-specification ultrahigh-strength steel plate and manufacturing method thereof | |
| CN114107824B (en) | Corrosion-resistant low-temperature-resistant spring steel for railway fastener and production method and heat treatment method thereof | |
| CN104911496A (en) | Steel for single-layer concrete conveying pipe of trailer pump vehicle and production method thereof | |
| CN113604748B (en) | Thick-specification weather-resistant corrosion-resistant Cr alloy steel plate and production method thereof | |
| CN109988968A (en) | A kind of big thickness Q690E grades of high strength steel plates of low-carbon-equivalent and its production method | |
| CN109487163A (en) | Direct quenching type surrenders 800MPa level structure steel plate and its production method | |
| CN112981238B (en) | Standard Q460D steel plate for forge piece production by continuous casting billet and manufacturing method thereof | |
| JP2023523623A (en) | High-strength anti-collapse oil casing and manufacturing method thereof | |
| CN110964985A (en) | Molybdenum-free low-alloy wear-resistant steel plate and production method thereof | |
| CN114892081B (en) | High-thickness 460 MPa-level steel plate with excellent low-temperature toughness for ocean engineering and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |